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Synthesis and Activity of A Single Active Site N-doped Electro-catalyst for Oxygen Reduction

Lookup NU author(s): Dr Maryam Bayati, Professor Keith Scott

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This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND).


Abstract

Nitrogen doped carbon materials are promising oxygen reduction reaction (ORR) catalysts which could potentially replace platinum. However, despite extensive studies, their active sites are still controversial and their impact on overall ORR remains obscure. Herein, we present a method for preparation of a single active site catalyst based on cycling an iron-inserted N-doped carbon catalyst in a wide potential window firstly in sulfuric acid and later in alkaline solution to study the contribution of the remaining one active group in overall activity. Following preparation of the metal-inserted N-doped carbon catalyst (MINC), its morphology was characterized using X-ray photoelectron spectroscopy (XPS), high resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), and the electro-catalytic behavior was investigated by employing linear sweep voltammetry (LSV) using a rotating ring disk electrode (RRDE). XPS revealed that graphitic nitrogen was the only remaining active nitrogen-containing group after elimination the pyridinic and pyrrolic groups and also iron nano-materials removal confirmed from auger peak of Fe LMMa and poisoning reaction with cyanide. The C1 s XPS region data showed an increase in the oxygen reduction intermediate C-OH peak, after the reaction, which indicates electrocatalytic activity of the graphitic carbon. Electrochemical studies revealed no significant changes in limiting current, a small increase in H2O2 production and 47 mV shift in half wave potential for degraded catalyst which is in line with previous theoretical calculations. (C) 2016 Elsevier Ltd. All rights reserved.


Publication metadata

Author(s): Bayati M, Scott K

Publication type: Article

Publication status: Published

Journal: Electrochimica Acta

Year: 2016

Volume: 213

Pages: 927-932

Print publication date: 20/09/2016

Online publication date: 26/06/2016

Acceptance date: 17/06/2016

ISSN (print): 0013-4686

ISSN (electronic): 1873-3859

Publisher: Elsevier

URL: http://dx.doi.org/10.1016/j.electacta.2016.06.084

DOI: 10.1016/j.electacta.2016.06.084


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